Piston



NOV. 12, 1935. s E E I 2,020,426

PISTON Filed Feb. 18, 1935 3 Sheets-Sheet l s 5 1% X 2 21's l 3 .H L l 73- 24' I 4 3 Inventor sze zenz S. E. MEYER- Nov. .12, 1935.

PISTON Filed Feb. 18, 1935 3 Sheets-Sheet 2 Inventor Nov. 12, 1935. s.E.'MEYER 2,020,426

' PISTON Filed Feb. 18, 1935 3 Sheets-Sheet 3 Inventor Patented Nov. 12,1935 UNITED STATES PATENT OFFlCE PISTON Stephen E. Meyer, Hayden, Ariz.Application February 18, 1935, Serial No. 7,128

3 Claim.

This invention relates to a piston for internal combustion engines,vacuum pumpsor any other type of machine using a piston which should bepractically fluid-tight. The present invention 5 is an improvement onPatent No. 1,898,845 and on the device disclosed in the applicationSerial No. 731,168.

The general object of the invention is to make the major portion of thepiston of two halves with springs for pressing the halves apart andagainst the walls of the cylinder, a spool-like member having its toppart forming the top of the piston and its-hub and lower part locatedbetween the two halves with sealing discs located between the top partof the spool. and the tops of the two halves of the body.

This invention also consists in certain other features of constructionand in the combination and arrangement of several parts, to behereinafter fully described, illustrated in the accompanying drawingsand specifically pointed out in the appended claims. p

In describing the invention in detail, reference will be had to theaccompanying drawings wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Fig. l is a fragmentary vertical sectional view through parts of a motorshowing the improved.

30 piston therein, the piston being in elevation.

Fig. 2 is a section on line 2--2 of Fig. 1. Fig.3 is a section on line33 of Fig. 1.

Fig. 4 is a view of one of the sealing blocks.

Fig. 5 is a section online 5-5 of Fig. 1.

Fig. 6 is a section on line 6-6 of Fig. 1.

. Fig. 7, is a section online '|-'I- of Fig. I.

Fig. 8 is a view looking towards the flat face of one of the sections ofthe body.

Fig. 9 is a top plan view of Fig. 8.

Fig. l is a top plan view of the spool.

Fig. 11 is an elevation of the spool.

Fig. 12 is a fragmentary vertical sectional view through the upper; partof the spool and the upper sealing disc.

Fig. 13 is a top plan view of one section of the lower sealing disc. I

Fig. 14 is a view looking towards the inner edge of the section shown inFig. 13.

Fig. 15 is a top plan view. of a section of the upper disc.

Fig. lfiis a view looking towards the inner edge of the section shown inFig. 15.

In these drawings, the letter A indicates the body of the piston whichis composed of the two half sections I, each section having a pair ofupper holes 2 therein and a pair of lower holes 3 therein, the holesopening out through the inner or-straight side of the sections andsprings 4 are placed in these four pair of holes and act to spread thetwo sections apart and against the internal wall of the cylinder B andto take up wear between the body A and the cylinder. The inner or flatface of each section is also provided with a large semi-circular recessin its lower part, and a smaller bore 6 which extends from the top ofthe'section into the top of the recess,

these recesses and bores forming circular recesses and'bores when thetwo'sections are placed together. A spool S is composed of a large topdisc I, a hub 8 and a smaller lower disc 9, the hub passing through thecircular bore and the small disc being located in the circular recessand springs placed in vertical holes .ll vformed in the sections I,press upon the lower disc 9 and tends to press the spool downwardly, theupper ends of'the holes ll terminating short of the top of the sectionsI of the body A. An upper sealing disc C and a lower sealing disc D areplaced between the upper disc 1 of the spool and the upper end of thebody A and each of. these sealing discs is composed of the two halfsections l2 .and l2"resp'ectively. These sections of the .upper. discare arranged at right angles to the sections of the lower disc and eachsection of ,each disc is formed with a centrally arranged semi-circularrecess [3 on its straight edge, a pair of innernotches M' and a pair ofouter notches Hi, all the notches opening out through the straight edgewith the outer notches 15 being of less length than the inner notchesl4. Sealing 5 blocks l6 are placed in the two pairs of notches l5 andsprings I! are placed in the two pairs of notches M of each disc, thesprings l1 tending to force the two sections of each disc apart andagainst the internal wall of the cylinder to pre- 40 vent leakagebetween the piston and the said wall and also to compensate for wear.The blocks 16 prevent leakage through the spaces between the twosections of each disc and by arranging the discs at right angles to eachother, the sections of one disc seal the gap between the sections of theother disc. The underface of the upper disc I of the 'spoolis grooved asshown at I8 to receive portions of the springs ll of .the upper disc asshown more particularly in Fig. 12. A pin l9 extends upwardly from oneof the sections I of the body A and extends into the space between thetwo sections of the lower sealing disc D and a pin 20 is carried by oneof the sections of the upper disc C and extends into the space betweenthe sections of the lower disc D as shown in Fig. 5, the projections 2|of the one section of the lower disc D, formed by the notches l4 and I5,being slightly shortened to receive the pins as sown in Fig. l3. Thesepins prevent the sealing discs from turning and holds them in theirrespective positions.

The two sections i of the body A are provided with the bores 22 whichopen out into the recesses 5 and these bores are adapted to receive theends of the wrist pin 23 to which the connecting rod 24 is connected.

Thus the piston provides a practically fluidtight means for preventingfluid from passing between itself and the cylinder wall and it will beseen that the power load as well as the compression load is converted tothe sealing discs and thereby to the wrist pin through the body by thetop disc 1 of the spool, the spool descending with the pressure exertedon top of the piston assembly.

This improved type of piston also compensates for wear between thepiston parts and between said parts and the walls of the cylinder.

It is thought from the foregoing description that the advantages andnovel features of I the invention will be readily apparent.

It is to be understood that changes may be made in the construction andin the combination and arrangement of the several parts, provided thatsuch changes fall within the scope of the appended claims.

I claim:

1. A piston of the class described comprising a body part formed of twohalf sections, spring means for forcing the sections apart, a spool-likemember having its hub passing betewen the two sections with its top discformingthe top of the piston and its bottom disc operatingin a recess inthe lower part of the body, a wrist pin passing through said recess,spring means tending to move the spool-like member downwardly, sectionalsealing rings located between the top of the body and the upper disc ofthe'spool, each sealing ring being formed of two sections, the sectionsof the upper ring being arranged at right angles to the sections of thelower ring,

I spring means for forcing the sections of the sealing rings apart,means bridging the gap between the sections of each sealing ring.

2. A piston of the class described comprising a body part formed of twohalf sections, spring means for forcing the sections apart, a spoollikemember having its hub passing between the two sections with its topdiscforming the top of the piston and its bottom disc operating in a 5recessin the lower part of the body, a wrist pin passing through saidrecess, spring means tending to move the spool-like member downwardly,sectional sealing rings located between the top of the body and theupper disc of the spool, each 10 sealing ring being formed of twosections, the sections of the 'upper ring being arranged at right anglesto the sections of the lower ring, spring means for forcing the sectionsof the sealing rings apart, means bridging the gap between 1 thesections of each sealing ring, and means for preventing rotary movementof the sealing rings.

3. A piston of the class described comprising a body formed of two halfsections, spring means for forcing the sections away from each other,the inner face of each section having a large lower semi-circular recesstherein and a smaller upper semi-circular recess, the recesses of thetwo sctions forming a large circular lower bore and a small circularupper bore, a spool-like 25 member including a large upper disc, a huband a small lower disc, said disc fitting in the large circular bore andthe hub passing through the small circular bore, spring means carried bythe body and engaging the lower disc for forcing the spool downwardly, awrist pin passing through the large bore, a pair of sealing discslocated between the upper disc of the spool and the upper end of thebody, each sealing disc being formed of two sections, spring means forforcing the sections of each disc apart, the adjacent edges of thesections of each disc having notches therein, and a centrally arrangedsemicircular recess, the two semi-circular recesses forming a passagefor the hub of the spool and the sections of one disc being arranged atright angles to the sections of the other disc, the spring means beingarranged in certain of the notches, sealing means located in the othernotches and bridging the space between the sections of each I sealingdisc, a pin carried by the body and extending into the space between thesections of the lower sealing disc, a pin carried by the upper sealingdisc and extending into the space between the sections of the lowerdisc.

STEPHEN E. MEYER.

